76 lines
1.7 KiB
Go
76 lines
1.7 KiB
Go
package atom
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import (
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"encoding/xml"
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"errors"
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"fmt"
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"html"
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)
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type Category struct {
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XMLName xml.Name `xml:"category"`
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*CommonAttributes
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Term string `xml:"term,attr"`
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Scheme string `xml:"scheme,attr,omitempty"` // IRI
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Label string `xml:"label,attr,omitempty"`
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}
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// NewCategory creates a new Category. It returns a *Category and an error.
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func NewCategory(term string) (*Category, error) {
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if term == "" {
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return nil, errors.New("error creating new category: term string empty")
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}
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return &Category{Term: term}, nil
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}
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// SetTerm sets the Term attribute of the Category. It returns an error.
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func (c *Category) SetTerm(t string) error {
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if t == "" {
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return errors.New("error setting term of category: t string empty")
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}
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c.Term = t
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return nil
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}
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// SetScheme sets the Scheme attribute of the Category. It returns an error.
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func (c *Category) SetScheme(s string) error {
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if !isValidIRI(s) {
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return fmt.Errorf("scheme %v not correctly formatted", s)
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}
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c.Scheme = s
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return nil
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}
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// SetLabel sets the Label attribute of the Category. It returns an error.
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func (c *Category) SetLabel(label string) error {
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if label == "" {
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return errors.New("error setting label of category: label string empty")
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}
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c.Label = html.UnescapeString(label)
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return nil
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}
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// Check checks the Category for incompatibilities with RFC4287. It returns an
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// error.
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func (c *Category) Check() error {
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if c.Term == "" {
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return fmt.Errorf("term attribute of category %v empty", c)
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}
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if c.Scheme != "" {
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if !isValidIRI(c.Scheme) {
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return fmt.Errorf("scheme attribute of category %v not correctly formatted", c)
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}
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}
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if !isCorrectlyEscaped(c.Label) {
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return fmt.Errorf("label attribute of category %v not correctly escaped", c)
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}
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return nil
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}
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